Related Clues:

• Corrosive compound
• Low-pH liquid
• LSD or HCl
• Battery filler
• DNA part
• Acetic __
• Litmus reddener
• Lysergic, for one
• Alkali counterpart
• Users drop it
• The 'A' in DNA
• Heartburn cause
• Base antagonist?
• Beyond sarcastic
• See 43 Across